PHP code for restricting IP segment access and forbidding IP address submission forms _ PHP Tutorial

PHP code used to restrict access to IP segments and prohibit IP address submission forms. Recently, the code for PHP to restrict access to IP segments and prohibit the submission of IP forms has found that a netizen from Yunnan often posted some spam comments on the fire network, because the dede php of www.veryhuo.com restricts access to IP segments and prohibits code from submitting IP forms

Recently, Xiaobian found that a netizen from Yunnan often posted some junk information comments at the customer's house. because of the dededecms architecture of www.bkjia.com, the system itself does not prohibit the IP address function. every day, I see these spam comments, although there are not many, but it makes people feel uncomfortable, how can we limit it? We only need to add the following code in feedback. php to judge.

Note: The following is only an example code for php ip address restriction. if you want to apply the code to CMS, modify it on your own. or if you are using DEDECMS, contact this site.

Copy to ClipboardReference: [www.bkjia.com] // Add IP address access restrictions
If (getenv ('http _ CLIENT_IP ') & strcasecmp (getenv ('http _ CLIENT_IP'), 'Unknown ')){
$ Userip = getenv ('http _ CLIENT_IP ');
} Elseif (getenv ('http _ X_FORWARDED_FOR ') & strcasecmp (getenv ('http _ X_FORWARDED_FOR'), 'Unknown ')){
$ Userip = getenv ('http _ X_FORWARDED_FOR ');
} Elseif (getenv ('remote _ ADDR ') & strcasecmp (getenv ('remote _ ADDR'), 'Unknown ')){
$ Userip = getenv ('remote _ ADDR ');
} Elseif (isset ($ _ SERVER ['remote _ ADDR ']) & $ _ SERVER ['remote _ ADDR '] & strcasecmp ($ _ SERVER ['remote _ ADDR'], 'Unknown ')){
$ Userip = $ _ SERVER ['remote _ ADDR '];
}
$ Ip_arr = explode ('.', $ userip );
# The restricted ip segment, for example, 192. 168 .*.*
If (! ($ Ip_arr [0] = '000000' & $ ip_arr [1] = '000000 '))){
Header ("http://www.liehuo.org"); // jump to the home address navigation after being disabled
Exit;
} Else
{
Header ("http://www.bkjia.com"); // normal IP directly access the home page
Exit;
}
?>

Recently, Xiao Bian found that a Yunnan netizen often posted some spam comments on www.veryhuo.com because of the DEDE series of www.veryhuo.com...